/*
 * @(#)SocketUtil.java	1.0 Mar 8, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.net;

import java.io.IOException;
import java.net.*;
import java.util.Collections;

public class SocketUtil
{
	/**
	 * Will return InetAddress of non-loopback, if available
	 * Will return loopback InetAddress if that is the only one available
	 * Will return null if no network interfaces were found
	 *
	 * @return inetaddress as per contract
	 */
	public static InetAddress getLocalHost()
	{
		InetAddress local = null;
		try{
			for(NetworkInterface nic : Collections.list(NetworkInterface.getNetworkInterfaces()))
			{
				for(InetAddress addr : Collections.list(nic.getInetAddresses()))
				{
					if(addr.isLoopbackAddress())
						local = addr;
					else
						return addr;
				}
			}
	    }catch(SocketException e){
			// no-op
		}

		return local;
	}

	public static void sendDatagramPacket(String serverNameOrIP, int serverPort, String message)
		throws UnknownHostException, SecurityException, IOException
	{
		InetAddress server = InetAddress.getByName(serverNameOrIP);
		sendDatagramPacket(server, serverPort, message);
	}

	public static void sendDatagramPacket(InetAddress server, int serverPort, String message)
		throws UnknownHostException, SecurityException, IOException
	{
		DatagramSocket serverSocket = new DatagramSocket();
		DatagramPacket packet = new DatagramPacket(message.getBytes(), message.length(), server, serverPort);
		serverSocket.send(packet);
		serverSocket.close();
	}
}
